The Design And Implementation Of Lower Cost Phased Array Antenna

Phased array antenna is capable of quickly scanning beams and transforming beam capabilities,and plays an important role in radar search,identification,classification,tracking,imaging,and anti-jamming.The higher cost of phased array antenna limits their widespread application in radar and other communication equipment.The research on reducing the cost of phased array antenna and improving the performance of phased array antenna is becoming hot.The phased array antenna designed in this paper is applied to the single pulse radar.In order to improve the performance of the phased array antenna,reduce the cost of phased array antenna and build a phased array antenna system,this paper designs a miniaturized wide beam antenna,a Radant lens phase shifter,and a feed network.The main research contents are as follows:First,a miniaturized wide beam antenna based on metamaterials was proposed.According to the metamaterial theory,the combination of the cross-toe capacitance and the meandering inductance of the composite left/right hand transmission line(CRLH TL)characteristics and the antenna patch.The designed antenna size is 7.32 mm ?9.45 mm,which is 30% smaller than the conventional antenna size,and the half-power beam widths of the E and H planes of the antenna pattern are 170.6° and 134.8°.The gain is 2.746 d B,and the bandwidth is 812.5MHz.The antenna unit is fabricated and measured.Next,the array of the phased array antenna is built by using the antenna unit.The side lobes of the array pattern is decreased by using the Taylor weighting function.The subtraction beam and summation beam was generating from the Taylor weighting pattern.Beam scanning is performed on the antenna array,and the beam scanning angle of the E-plane and the H-plane is ?65? and ?45?.Then,in order to build the phased array antenna system studied in this paper,the feed network of phased array antenna is designed.In order to simplify the phased array feed network,a one divided to six Wilkinson power splitter is proposed.At the operating frequency,the return loss of the power splitter each port is less than-22.89 d B,and the maximum phase difference between the output ports of the power splitter is 3°.The proposed power splitter is fabricated and measured.For the sake of achieving the summation and subtraction of the received signals,a three-branch bridge and a runway hybrid ring are designed.The return loss of each port of the designed two devices are less than-15 d B.The two pairs of signal summing and subtracting devices are fabricated and measured.Finally,for the sake of decreasing the cost of the phased array antenna system,a six-bit Radant lens phase shifter was proposed.The phased array antenna adopted the Radant lens phase shifter technology enables the M ?N antenna elements to achieve two-dimensional scanning using M(10)N phase shifters.In the design of the lens phase shifter,first,the basic unit of the phase shifter is designed,then the unit is composed of phase shifter blocks,and then the phase shifter blocks are combined to form a one bit Radant lens phase shifter.Finally,six one bit Radant lens phase shifters are arranged in the direction of the electric field to form a six-bit Radant lens phase shifter.The designed six-bit Radant lens phase shifter performs beam scanning with a phase gradient difference of ? 45° and ? 90° in one dimension.